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<H3>compute meso_rho/atom command 
</H3>
<P><B>Syntax:</B>
</P>
<PRE>compute ID group-ID meso_rho/atom 
</PRE>
<UL><LI>ID, group-ID are documented in <A HREF = "compute.html">compute</A> command
<LI>meso_rho/atom = style name of this compute command 
</UL>
<P><B>Examples:</B>
</P>
<PRE>compute 1 all meso_rho/atom 
</PRE>
<P><B>Description:</B>
</P>
<P>Define a computation that calculates the per-atom mesoscopic density
for each atom in a group.
</P>
<P>The mesoscopic density is the mass density of a mesoscopic particle,
calculated by kernel function interpolation using "pair style
sph/rhosum".
</P>
<P>See <A HREF = "USER/sph/SPH_LAMMPS_userguide.pdf">this PDF guide</A> to using SPH in
LAMMPS.
</P>
<P>The value of the mesoscopic density will be 0.0 for atoms not in the
specified compute group.
</P>
<P><B>Output info:</B>
</P>
<P>This compute calculates a per-atom vector, which can be accessed by
any command that uses per-atom values from a compute as input.  See
<A HREF = "Section_howto.html#howto_15">Section_howto 15</A> for an overview of
LAMMPS output options.
</P>
<P>The per-atom vector values will be in mass/volume <A HREF = "units.html">units</A>.
</P>
<P><B>Restrictions:</B>
</P>
<P>This compute is part of the USER-SPH package.  It is only enabled if
LAMMPS was built with that package.  See the <A HREF = "Section_start.html#start_3">Making
LAMMPS</A> section for more info.
</P>
<P><B>Related commands:</B>
</P>
<P><A HREF = "dump.html">dump custom</A>
</P>
<P><B>Default:</B> none
</P>
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